It is used to present or offer something to someone.
Example:
* "Aquí está tu libro." (Here is your book.)
* "Aquí está el café." (Here is the coffee.)
* "Aquí está la información que necesitas." (Here is the information you need.)
It can also be used to indicate that something is located in a specific place.
Example:
* "Aquí está el baño." (The bathroom is here.)
* "Aquí está la entrada." (The entrance is here.)
The word "está" is the third-person singular form of the verb "estar" which means "to be". It is used in the present tense.